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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2012 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.util.Collection;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.util.concurrent.BlockingDeque;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.concurrent.TimeUnit;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>/**<a name="line.23"></a>
<span class="sourceLineNo">024</span> * A {@link BlockingDeque} which forwards all its method calls to another {@code BlockingDeque}.<a name="line.24"></a>
<span class="sourceLineNo">025</span> * Subclasses should override one or more methods to modify the behavior of the backing deque as<a name="line.25"></a>
<span class="sourceLineNo">026</span> * desired per the &lt;a href="http://en.wikipedia.org/wiki/Decorator_pattern"&gt;decorator pattern&lt;/a&gt;.<a name="line.26"></a>
<span class="sourceLineNo">027</span> *<a name="line.27"></a>
<span class="sourceLineNo">028</span> * &lt;p&gt;&lt;b&gt;Warning:&lt;/b&gt; The methods of {@code ForwardingBlockingDeque} forward<a name="line.28"></a>
<span class="sourceLineNo">029</span> * &lt;b&gt;indiscriminately&lt;/b&gt; to the methods of the delegate. For example, overriding {@link #add}<a name="line.29"></a>
<span class="sourceLineNo">030</span> * alone &lt;b&gt;will not&lt;/b&gt; change the behaviour of {@link #offer} which can lead to unexpected<a name="line.30"></a>
<span class="sourceLineNo">031</span> * behaviour. In this case, you should override {@code offer} as well, either providing your own<a name="line.31"></a>
<span class="sourceLineNo">032</span> * implementation, or delegating to the provided {@code standardOffer} method.<a name="line.32"></a>
<span class="sourceLineNo">033</span> *<a name="line.33"></a>
<span class="sourceLineNo">034</span> * &lt;p&gt;<a name="line.34"></a>
<span class="sourceLineNo">035</span> * The {@code standard} methods are not guaranteed to be thread-safe, even when all of the methods<a name="line.35"></a>
<span class="sourceLineNo">036</span> * that they depend on are thread-safe.<a name="line.36"></a>
<span class="sourceLineNo">037</span> *<a name="line.37"></a>
<span class="sourceLineNo">038</span> * @author Emily Soldal<a name="line.38"></a>
<span class="sourceLineNo">039</span> * @since 14.0<a name="line.39"></a>
<span class="sourceLineNo">040</span> */<a name="line.40"></a>
<span class="sourceLineNo">041</span>public abstract class ForwardingBlockingDeque&lt;E&gt;<a name="line.41"></a>
<span class="sourceLineNo">042</span>    extends ForwardingDeque&lt;E&gt; implements BlockingDeque&lt;E&gt; {<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>  /** Constructor for use by subclasses. */<a name="line.44"></a>
<span class="sourceLineNo">045</span>  protected ForwardingBlockingDeque() {}<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>  @Override protected abstract BlockingDeque&lt;E&gt; delegate();<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>  @Override<a name="line.49"></a>
<span class="sourceLineNo">050</span>  public int remainingCapacity() {<a name="line.50"></a>
<span class="sourceLineNo">051</span>    return delegate().remainingCapacity();<a name="line.51"></a>
<span class="sourceLineNo">052</span>  }<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>  @Override<a name="line.54"></a>
<span class="sourceLineNo">055</span>  public void putFirst(E e) throws InterruptedException {<a name="line.55"></a>
<span class="sourceLineNo">056</span>    delegate().putFirst(e);<a name="line.56"></a>
<span class="sourceLineNo">057</span>  }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>  @Override<a name="line.59"></a>
<span class="sourceLineNo">060</span>  public void putLast(E e) throws InterruptedException {<a name="line.60"></a>
<span class="sourceLineNo">061</span>    delegate().putLast(e);<a name="line.61"></a>
<span class="sourceLineNo">062</span>  }<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>  @Override<a name="line.64"></a>
<span class="sourceLineNo">065</span>  public boolean offerFirst(E e, long timeout, TimeUnit unit) throws InterruptedException {<a name="line.65"></a>
<span class="sourceLineNo">066</span>    return delegate().offerFirst(e, timeout, unit);<a name="line.66"></a>
<span class="sourceLineNo">067</span>  }<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>  @Override<a name="line.69"></a>
<span class="sourceLineNo">070</span>  public boolean offerLast(E e, long timeout, TimeUnit unit) throws InterruptedException {<a name="line.70"></a>
<span class="sourceLineNo">071</span>    return delegate().offerLast(e, timeout, unit);<a name="line.71"></a>
<span class="sourceLineNo">072</span>  }<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>  @Override<a name="line.74"></a>
<span class="sourceLineNo">075</span>  public E takeFirst() throws InterruptedException {<a name="line.75"></a>
<span class="sourceLineNo">076</span>    return delegate().takeFirst();<a name="line.76"></a>
<span class="sourceLineNo">077</span>  }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>  @Override<a name="line.79"></a>
<span class="sourceLineNo">080</span>  public E takeLast() throws InterruptedException {<a name="line.80"></a>
<span class="sourceLineNo">081</span>    return delegate().takeLast();<a name="line.81"></a>
<span class="sourceLineNo">082</span>  }<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span>  @Override<a name="line.84"></a>
<span class="sourceLineNo">085</span>  public E pollFirst(long timeout, TimeUnit unit) throws InterruptedException {<a name="line.85"></a>
<span class="sourceLineNo">086</span>    return delegate().pollFirst(timeout, unit);<a name="line.86"></a>
<span class="sourceLineNo">087</span>  }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>  @Override<a name="line.89"></a>
<span class="sourceLineNo">090</span>  public E pollLast(long timeout, TimeUnit unit) throws InterruptedException {<a name="line.90"></a>
<span class="sourceLineNo">091</span>    return delegate().pollLast(timeout, unit);<a name="line.91"></a>
<span class="sourceLineNo">092</span>  }<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span>  @Override<a name="line.94"></a>
<span class="sourceLineNo">095</span>  public void put(E e) throws InterruptedException {<a name="line.95"></a>
<span class="sourceLineNo">096</span>    delegate().put(e);<a name="line.96"></a>
<span class="sourceLineNo">097</span>  }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>  @Override<a name="line.99"></a>
<span class="sourceLineNo">100</span>  public boolean offer(E e, long timeout, TimeUnit unit) throws InterruptedException {<a name="line.100"></a>
<span class="sourceLineNo">101</span>    return delegate().offer(e, timeout, unit);<a name="line.101"></a>
<span class="sourceLineNo">102</span>  }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>  @Override<a name="line.104"></a>
<span class="sourceLineNo">105</span>  public E take() throws InterruptedException {<a name="line.105"></a>
<span class="sourceLineNo">106</span>    return delegate().take();<a name="line.106"></a>
<span class="sourceLineNo">107</span>  }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>  @Override<a name="line.109"></a>
<span class="sourceLineNo">110</span>  public E poll(long timeout, TimeUnit unit) throws InterruptedException {<a name="line.110"></a>
<span class="sourceLineNo">111</span>    return delegate().poll(timeout, unit);<a name="line.111"></a>
<span class="sourceLineNo">112</span>  }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span>  @Override<a name="line.114"></a>
<span class="sourceLineNo">115</span>  public int drainTo(Collection&lt;? super E&gt; c) {<a name="line.115"></a>
<span class="sourceLineNo">116</span>    return delegate().drainTo(c);<a name="line.116"></a>
<span class="sourceLineNo">117</span>  }<a name="line.117"></a>
<span class="sourceLineNo">118</span><a name="line.118"></a>
<span class="sourceLineNo">119</span>  @Override<a name="line.119"></a>
<span class="sourceLineNo">120</span>  public int drainTo(Collection&lt;? super E&gt; c, int maxElements) {<a name="line.120"></a>
<span class="sourceLineNo">121</span>    return delegate().drainTo(c, maxElements);<a name="line.121"></a>
<span class="sourceLineNo">122</span>  }<a name="line.122"></a>
<span class="sourceLineNo">123</span>}<a name="line.123"></a>




























































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